Fixed some compiler warnings

components/BottomAppBar/examples/supplemental/BottomAppBarTypicalUseSupplemental.m

@@ -58,7 +58,7 @@ - (void)viewWillAppear:(BOOL)animated {
 @implementation BottomAppBarExampleTableViewController
 
 - (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
-  self = [super initWithNibName:nil bundle:nil];
+  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
   if (self) {
     NSArray<NSString *> *listItems = @[ @"Leading Floating Button",
                                         @"Center Floating Button",
@@ -90,7 +90,7 @@ - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger
 
 - (UITableViewCell *)tableView:(UITableView *)tableView
          cellForRowAtIndexPath:(NSIndexPath *)indexPath {
-  UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:@"cell"];
+  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
   if (!cell) {
     cell =
         [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];

components/Buttons/examples/supplemental/ButtonsTypicalUseSupplemental.m

@@ -83,7 +83,7 @@ - (void)viewDidLayoutSubviews {
   CGFloat lastButtonMaxY = (CGRectGetHeight(lastButton.bounds) / 2) + lastButton.center.y;
   if (lastButtonMaxY > CGRectGetHeight(self.view.bounds)) {
     CGFloat columnOffset = CGRectGetWidth(self.view.bounds) / 4;
-    NSUInteger splitIndex = ceil(self.buttons.count / 2);
+    NSUInteger splitIndex = (NSUInteger)ceil(self.buttons.count / 2);
 
     if (((MDCButton *)self.buttons[splitIndex - 1]).enabled) {
       splitIndex++;
@@ -117,7 +117,7 @@ - (void)layoutButtonsInRange:(NSRange)range around:(CGFloat)centerX {
   MDCButton *lastButton = self.buttons[NSMaxRange(range) - 1];
   CGFloat verticalCenterY =
       (viewHeight - (lastButton.center.y + (CGRectGetHeight(lastButton.bounds) / 2))) / 2;
-  for (NSInteger i = range.location; i < NSMaxRange(range); i++) {
+  for (NSUInteger i = range.location; i < NSMaxRange(range); i++) {
     MDCButton *button = self.buttons[i];
     UILabel *label = self.labels[i];
     button.center = MDCRoundCenterWithBoundsAndScale(CGPointMake(button.center.x,

components/Dialogs/examples/DialogsAlertViewController.m

@@ -31,24 +31,24 @@ - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPa
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
   switch (indexPath.row) {
     case 0:
-      [self didTapShowAlert:nil];
+      [self didTapShowAlert];
       break;
     case 1:
-      [self didTapShowLongAlert:nil];
+      [self didTapShowLongAlert];
       break;
     case 2:
-      [self didTapNondismissingAlert:nil];
+      [self didTapNondismissingAlert];
       break;
     case 3:
-      [self didTapDynamicAlert:nil];
+      [self didTapDynamicAlert];
       break;
     case 4:
-      [self didTapOverpopulatedAlert:nil];
+      [self didTapOverpopulatedAlert];
       break;
   }
 }
 
-- (IBAction)didTapShowAlert:(id)sender {
+- (IBAction)didTapShowAlert {
 
   NSString *titleString = @"Using Material alert controller?";
   NSString *messageString = @"Be careful with modal alerts as they can be annoying if over-used.";
@@ -71,7 +71,7 @@ - (IBAction)didTapShowAlert:(id)sender {
   [self presentViewController:materialAlertController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapShowLongAlert:(id)sender {
+- (IBAction)didTapShowLongAlert {
   NSString *messageString =
       @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur "
        "ultricies diam libero, eget porta arcu feugiat sit amet. Maecenas placerat felis sed risus "
@@ -114,16 +114,16 @@ - (IBAction)didTapShowLongAlert:(id)sender {
   MDCAlertController *materialAlertController =
       [MDCAlertController alertControllerWithTitle:nil message:messageString];
 
-  MDCAlertAction *action = [MDCAlertAction actionWithTitle:@"OK"
-                                                   handler:^(MDCAlertAction *action) {
+  MDCAlertAction *okAction = [MDCAlertAction actionWithTitle:@"OK"
+                                                     handler:^(MDCAlertAction *action) {
                                                      NSLog(@"%@", @"OK pressed");
                                                    }];
-  [materialAlertController addAction:action];
+  [materialAlertController addAction:okAction];
 
   [self presentViewController:materialAlertController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapNondismissingAlert:(id)sender {
+- (IBAction)didTapNondismissingAlert {
   NSString *titleString = @"This alert requires an action.";
   NSString *messageString = @"You can't dismiss it by tapping the background. You must choose "
                              "one of the actions available.";
@@ -151,7 +151,7 @@ - (IBAction)didTapNondismissingAlert:(id)sender {
   [self presentViewController:materialAlertController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapDynamicAlert:(id)sender {
+- (IBAction)didTapDynamicAlert {
   // The following strings are extra verbose to better demonstrate the dynamic handling of an alert.
   NSString *titleString = @"This alert supports Dynamic Type font sizing.";
   NSString *messageString =
@@ -185,7 +185,7 @@ - (IBAction)didTapDynamicAlert:(id)sender {
   [self presentViewController:materialAlertController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapOverpopulatedAlert:(id)sender {
+- (IBAction)didTapOverpopulatedAlert {
   NSString *messageString =
       @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur "
       "ultricies diam libero, eget porta arcu feugiat sit amet. Maecenas placerat felis sed risus "
@@ -229,11 +229,11 @@ - (IBAction)didTapOverpopulatedAlert:(id)sender {
       [MDCAlertController alertControllerWithTitle:nil message:messageString];
   materialAlertController.mdc_adjustsFontForContentSizeCategory = YES;
 
-  MDCAlertAction *action = [MDCAlertAction actionWithTitle:@"OK"
-                                                   handler:^(MDCAlertAction *action) {
-                                                     NSLog(@"%@", @"OK pressed");
-                                                   }];
-  [materialAlertController addAction:action];
+  MDCAlertAction *okAction = [MDCAlertAction actionWithTitle:@"OK"
+                                                     handler:^(MDCAlertAction *action) {
+                                                       NSLog(@"%@", @"OK pressed");
+                                                     }];
+  [materialAlertController addAction:okAction];
 
   MDCAlertAction *action2 = [MDCAlertAction actionWithTitle:@"OK - 2"
                                                    handler:^(MDCAlertAction *action) {

components/Dialogs/examples/DialogsTypicalUseViewController.m

@@ -38,17 +38,17 @@ - (void)viewDidLoad {
 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
   if (indexPath.row == 0) {
-    [self didTapProgrammatic:nil];
+    [self didTapProgrammatic];
   } else if (indexPath.row == 1) {
-    [self didTapStoryboard:nil];
+    [self didTapStoryboard];
   } else if (indexPath.row == 2) {
-    [self didTapModalProgrammatic:nil];
+    [self didTapModalProgrammatic];
   } else if (indexPath.row == 3) {
-    [self didTapOpenURL:nil];
+    [self didTapOpenURL];
   }
 }
 
-- (IBAction)didTapProgrammatic:(id)sender {
+- (IBAction)didTapProgrammatic {
   UIViewController *viewController =
       [[ProgrammaticViewController alloc] initWithNibName:nil bundle:nil];
   viewController.modalPresentationStyle = UIModalPresentationCustom;
@@ -57,7 +57,7 @@ - (IBAction)didTapProgrammatic:(id)sender {
   [self presentViewController:viewController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapModalProgrammatic:(id)sender {
+- (IBAction)didTapModalProgrammatic {
   UIViewController *viewController =
       [[ProgrammaticViewController alloc] initWithNibName:nil bundle:nil];
   viewController.modalPresentationStyle = UIModalPresentationCustom;
@@ -72,7 +72,7 @@ - (IBAction)didTapModalProgrammatic:(id)sender {
   }
 }
 
-- (IBAction)didTapOpenURL:(id)sender {
+- (IBAction)didTapOpenURL {
   UIViewController *viewController =
     [[OpenURLViewController alloc] initWithNibName:nil bundle:nil];
   viewController.modalPresentationStyle = UIModalPresentationCustom;
@@ -81,7 +81,7 @@ - (IBAction)didTapOpenURL:(id)sender {
   [self presentViewController:viewController animated:YES completion:NULL];
 }
 
-- (IBAction)didTapStoryboard:(id)sender {
+- (IBAction)didTapStoryboard {
   // If you are using this code outside of the MDCCatalog in your own app, your bundle may be nil.
   NSBundle *bundle = [NSBundle bundleForClass:[DialogsTypicalUseViewController class]];
   UIStoryboard *storyboard =

components/FlexibleHeader/examples/FlexibleHeaderFABExample.m

@@ -116,7 +116,7 @@ - (void)viewWillTransitionToSize:(CGSize)size
 #pragma mark -
 
 - (void)didTap:(id)sender {
-  NSLog(@"Button was tapped.");
+  NSLog(@"Button was tapped. %@", sender);
 }
 
 #pragma mark - <UIScrollViewDelegate>

components/FlexibleHeader/examples/FlexibleHeaderPageControlExample.m

@@ -105,7 +105,7 @@ - (void)viewDidLoad {
   NSMutableArray *pages = [NSMutableArray array];
 
   // Add pages to scrollView.
-  for (NSInteger i = 0; i < pageColors.count; i++) {
+  for (NSUInteger i = 0; i < pageColors.count; i++) {
     CGRect pageFrame = CGRectOffset(pageScrollViewFrame, i * boundsWidth, 0);
     UILabel *page = [[UILabel alloc] initWithFrame:pageFrame];
     page.text = [NSString stringWithFormat:@"Page %zd", i + 1];

components/FlexibleHeader/examples/FlexibleHeaderTopLayoutGuideExample.m

@@ -155,7 +155,7 @@ - (void)viewDidLayoutSubviews {
   [super viewDidLayoutSubviews];
 }
 
-#pragma - MDCFlexibleHeaderViewLayoutDelegate
+#pragma mark - MDCFlexibleHeaderViewLayoutDelegate
 
 - (void)flexibleHeaderViewController:(MDCFlexibleHeaderViewController *)flexibleHeaderViewController
     flexibleHeaderViewFrameDidChange:(MDCFlexibleHeaderView *)flexibleHeaderView {

components/FlexibleHeader/examples/FlexibleHeaderUINavigationBarExample.m

@@ -81,10 +81,10 @@ - (void)commonMDCFlexibleHeaderViewControllerInit {
                                                               target:self
                                                               action:@selector(doneAction:)];
 
-  UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:@"UINavigationBar"];
-  [navItem setLeftBarButtonItem:backItem animated:YES];
-  [navItem setRightBarButtonItem:doneItem animated:YES];
-  [navBar setItems:[NSArray arrayWithObject:navItem] animated:YES];
+
+  [self.navigationItem setLeftBarButtonItem:backItem animated:YES];
+  [self.navigationItem setRightBarButtonItem:doneItem animated:YES];
+  [navBar setItems:@[self.navigationItem] animated:YES];
 
   self.button = [[UIButton alloc] init];
   [self.button setTitle:@"UIButton" forState:UIControlStateNormal];
@@ -98,7 +98,7 @@ - (void)commonMDCFlexibleHeaderViewControllerInit {
 }
 
 - (void)didTapButton:(id)sender {
-  NSLog(@"Button Tapped");
+  NSLog(@"Button Tapped: %@", sender);
 }
 
 - (void)doneAction:(id)sender {

components/FlexibleHeader/examples/supplemental/FlexibleHeaderConfiguratorSupplemental.m

@@ -49,7 +49,7 @@ - (instancetype)init {
 }
 
 - (instancetype)initWithStyle:(UITableViewStyle)style {
-  self = [super initWithStyle:kStyle];
+  self = [super initWithStyle:style];
   if (self) {
     self.fhvc = [[MDCFlexibleHeaderViewController alloc] initWithNibName:nil bundle:nil];
     [self addChildViewController:self.fhvc];

components/FlexibleHeader/examples/supplemental/FlexibleHeaderUINavigationBarSupplemental.m

@@ -41,10 +41,6 @@ - (BOOL)catalogShouldHideNavigation {
 
 @implementation FlexibleHeaderUINavigationBarExample (Supplemental)
 
-- (void)didTap:(id)button {
-  NSLog(@"Button Tapped.");
-}
-
 - (UIStatusBarStyle)preferredStatusBarStyle {
   return UIStatusBarStyleLightContent;
 }

components/PageControl/examples/PageControlAnimationBlockExample.m

@@ -55,7 +55,7 @@ - (void)viewDidLoad {
   NSMutableArray *pages = [NSMutableArray array];
 
   // Add pages to scrollView.
-  for (NSInteger i = 0; i < pageColors.count; i++) {
+  for (NSUInteger i = 0; i < pageColors.count; i++) {
     CGRect pageFrame = CGRectOffset(self.view.bounds, i * boundsWidth, 0);
     UILabel *page = [[UILabel alloc] initWithFrame:pageFrame];
     page.text = [NSString stringWithFormat:@"Page %zd", i + 1];

components/PageControl/examples/PageControlButtonExample.m

@@ -53,7 +53,7 @@ - (void)viewDidLoad {
   NSMutableArray *pages = [NSMutableArray array];
 
   // Add pages to scrollView.
-  for (NSInteger i = 0; i < pageColors.count; i++) {
+  for (NSUInteger i = 0; i < pageColors.count; i++) {
     CGRect pageFrame = CGRectOffset(self.view.bounds, i * boundsWidth, 0);
     UILabel *page = [[UILabel alloc] initWithFrame:pageFrame];
     page.text = [NSString stringWithFormat:@"Page %zd", i + 1];

components/PageControl/examples/PageControlTypicalUseExample.m

@@ -52,7 +52,7 @@ - (void)viewDidLoad {
   NSMutableArray *pages = [NSMutableArray array];
 
   // Add pages to scrollView.
-  for (NSInteger i = 0; i < pageColors.count; i++) {
+  for (NSUInteger i = 0; i < pageColors.count; i++) {
     CGRect pageFrame = CGRectOffset(self.view.bounds, i * boundsWidth, 0);
     UILabel *page = [[UILabel alloc] initWithFrame:pageFrame];
     page.text = [NSString stringWithFormat:@"Page %zd", i + 1];

components/ProgressView/examples/ProgressViewExample.m

@@ -71,15 +71,15 @@ - (void)setupProgressViews {
   _backwardProgressResetView.translatesAutoresizingMaskIntoConstraints = NO;
   [self.view addSubview:_backwardProgressResetView];
   // Have a non-zero progress at setup time.
-  _backwardProgressResetView.progress = 0.33;
+  _backwardProgressResetView.progress = 0.33f;
 
   _backwardProgressAnimateView = [[MDCProgressView alloc] init];
   _backwardProgressAnimateView.translatesAutoresizingMaskIntoConstraints = NO;
   _backwardProgressAnimateView.backwardProgressAnimationMode =
       MDCProgressViewBackwardAnimationModeAnimate;
   [self.view addSubview:_backwardProgressAnimateView];
   // Have a non-zero progress at setup time.
-  _backwardProgressAnimateView.progress = 0.33;
+  _backwardProgressAnimateView.progress = 0.33f;
 }
 
 @end

components/ShadowElevations/examples/ShadowElevationsPointsLabel.m

@@ -28,4 +28,8 @@ - (void)setElevation:(MDCShadowElevation)elevation {
   [(MDCShadowLayer *)self.layer setElevation:elevation];
 }
 
+- (MDCShadowElevation)elevation {
+  return [(MDCShadowLayer *)self.layer elevation];
+}
+
 @end

components/Slider/examples/SliderAutolayoutExampleViewController.m

@@ -41,7 +41,7 @@ - (void)viewDidLoad {
 - (IBAction)materialSliderDidChange:(id)sender {
   NSLog(@"Material Slider : %.2f", self.materialSlider.value);
 
-  self.vanillaSlider.value = self.materialSlider.value;
+  self.vanillaSlider.value = (float)self.materialSlider.value;
 }
 
 - (IBAction)vanillaSliderDidChange:(id)sender {

components/Tabs/examples/supplemental/TabBarIconExampleSupplemental.h

@@ -29,11 +29,11 @@
 
 @interface TabBarIconExample : UIViewController <MDCTabBarDelegate>
 
-@property MDCTabBar *_Nullable tabBar;
-@property MDCRaisedButton *_Nullable alignmentButton;
-@property MDCAppBar *_Nullable appBar;
-@property UIScrollView *_Nullable scrollView;
-@property UIView *_Nullable starPage;
+@property(nonatomic, nullable) MDCTabBar * tabBar;
+@property(nonatomic, nullable) MDCRaisedButton * alignmentButton;
+@property(nonatomic, nullable) MDCAppBar * appBar;
+@property(nonatomic, nullable) UIScrollView * scrollView;
+@property(nonatomic, nullable) UIView * starPage;
 
 @end
 

components/Tabs/examples/supplemental/TabBarTextOnlyExampleSupplemental.h

@@ -27,9 +27,9 @@
 
 @interface TabBarTextOnlyExample : MDCCollectionViewController
 
-@property(nullable) MDCAppBar *appBar;
-@property(nullable) MDCTabBar *tabBar;
-@property(nullable) NSArray *choices;
+@property(nonatomic, nullable) MDCAppBar *appBar;
+@property(nonatomic, nullable) MDCTabBar *tabBar;
+@property(nonatomic, nullable) NSArray *choices;
 @end
 
 @interface TabBarTextOnlyExample (Supplemental)

components/Typography/examples/TypographyCustomFontViewController.m

@@ -74,17 +74,17 @@ - (void)viewDidLoad {
                    ];
 
    _opacities = @[
-                  [NSNumber numberWithFloat:[MDCTypography headlineFontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography titleFontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography subheadFontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography body2FontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography body1FontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography captionFontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography buttonFontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography display1FontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography display2FontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography display3FontOpacity]],
-                  [NSNumber numberWithFloat:[MDCTypography display4FontOpacity]]
+                  @([MDCTypography headlineFontOpacity]),
+                  @([MDCTypography titleFontOpacity]),
+                  @([MDCTypography subheadFontOpacity]),
+                  @([MDCTypography body2FontOpacity]),
+                  @([MDCTypography body1FontOpacity]),
+                  @([MDCTypography captionFontOpacity]),
+                  @([MDCTypography buttonFontOpacity]),
+                  @([MDCTypography display1FontOpacity]),
+                  @([MDCTypography display2FontOpacity]),
+                  @([MDCTypography display3FontOpacity]),
+                  @([MDCTypography display4FontOpacity])
                   ];
 
    [[NSNotificationCenter defaultCenter] addObserver:self